I have a very large calculated table that I want to duplicate, then tweak the DAX on about 1/3 of the columns. Remaking all 170 columns seems painfully slow and unnecessary, and it's not a query table, so copying and pasting isn't an option. I tried creating a new table and saying NewTable = TableIWantToCopy, but doing it that way none of the DAX carries over so it's "fixed" as a duplicate of the original.
I see that you can click on a table and select Copy, but there's no paste, so I suppose this is intended for copying into Excel or similar. It would seem duplicating a table in-place in a way that you could then modify would be a pretty basic feature, but if it's here I cannot find it.
Wow pretty lame that there's not a way to do that. I'm looking for the same thing. For me it's usually the 'calendar' or 'date' table that's needed for some many scenarios.
Here's my solution: Make a copy of the PBI Desktop file that contains the calculated table. Delete everything else in the file besides the calculated table. Every time you want to create a new file with that calculated table, make a copy of that 'template' file and start building from there!